Part IV -- Overcurrent
Grounding vs Bonding Seminar
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Top 2005 Code Changes
Part IV --
By Mike Holt
The overcurrent protective device of a legally required
system must now be selectively coordinated. With proper selectively
coordinated overcurrent protective devices, a fault in the legally
required system will be localized to the overcurrent protective device
nearest the fault. This allows the remainder of the system to continue
to function. (Note: Code text has been paraphrased.)
What the Code says:
protection devices for legally required power systems must be
selectively coordinated with all supply side overcurrent protective
devices. (Text new to the Code is underlined.)
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While working for an electrical service company in
Florida, I was called to an apartment complex to repair an exit light.
When I removed the cover to the light, I noticed a burn mark in the
metal exit light canopy where the wires transitioned from the ceiling
box. Upon closer inspection, I could see the bare copper conductor
the wire insulation had been compromised. It appeared as if the wire
shorted a few times, burning a space between it and the metal canopy.
When I finally located the fusible safety switch and opened it to
the fuses, I found that someone had wrapped the fuses in aluminum foil!
Does anyone know the rating of aluminum foil?
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Cool Electronic Cabinets
Stop electronic control downtime due to heat, dirt and moisture. UL
Listed Cabinet Coolers produce 20 degree Fahrenheit air from an
supply of compressed air to cool electrical controls. Thermostat
minimizes air usage. Maintains the NEMA 4, 4X (stainless steel) and 12
rating of the enclosure. Web site offers detailed information,
downloadable drawings and PDF literature.
What's Wrong Here?
By Joe Tedesco
Got a guess for how this installation violates the NEC?
Web site to see the answer.
Hint: Was there ever a device box?
By Mike Holt
Q. When is a two-pole breaker required for a
multiwire branch circuit?
Visit EC&M's Web
site to see the answer.
By Steven Owen
A small strip mall consists of the following 10
a pharmacy; a 24-hour emergency medical treatment center, which
a limited amount of critical care; and eight different retail shops.
common service disconnecting means for the entire group of tenants is
equipped with ground-fault protection (one service and 10 feeders).
Does the Code require any additional level of ground-fault protection
any of the feeder disconnecting means?
Visit EC&M's Web
for the answer and explanation.
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Committee on Electrical Systems Maintenance
Committee on Health Care Facilities - Electrical Equipment
Committee on Health Care Facilities - Electrical Systems
Anyone interested in serving can download the application form at NFPA's Web
Shows and Events
Grounding and bonding of electrical systems, sensitive
electronic, and communications equipment is the most important and
understood activity in the electrical, data processing, and
communications industry. At four two-day seminars, Code expert Mike
will explain the basics as well as the advance concepts necessary to
understand the practical grounding and bonding rules in the NEC for
systems not over 600V. Download
the conference brochure for specific dates and locations.
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